Book Image

Learn MongoDB 4.x

By : Doug Bierer
Book Image

Learn MongoDB 4.x

By: Doug Bierer

Overview of this book

When it comes to managing a high volume of unstructured and non-relational datasets, MongoDB is the defacto database management system (DBMS) for DBAs and data architects. This updated book includes the latest release and covers every feature in MongoDB 4.x, while helping you get hands-on with building a MongoDB database app. You’ll get to grips with MongoDB 4.x concepts such as indexes, database design, data modeling, authentication, and aggregation. As you progress, you’ll cover tasks such as performing routine operations when developing a dynamic database-driven website. Using examples, you’ll learn how to work with queries and regular database operations. The book will not only guide you through design and implementation, but also help you monitor operations to achieve optimal performance and secure your MongoDB database systems. You’ll also be introduced to advanced techniques such as aggregation, map-reduce, complex queries, and generating ad hoc financial reports on the fly. Later, the book shows you how to work with multiple collections as well as embedded arrays and documents, before finally exploring key topics such as replication, sharding, and security using practical examples. By the end of this book, you’ll be well-versed with MongoDB 4.x and be able to perform development and administrative tasks associated with this NoSQL database.
Table of Contents (22 chapters)
1
Section 1: Essentials
5
Section 2: Building a Database-Driven Web Application
9
Section 3: Digging Deeper
13
Section 4: Replication, Sharding, and Security in a Financial Environment
14
Working with Complex Documents Across Collections

Using geospatial query operators

MongoDB geospatial query operators are used to perform queries based on geographical or spatial sets of coordinates. As noted previously, only two operators support the flat model; however, all geospatial operators support the spherical model. Here is a brief summary of the MongoDB geospatial query operators:

Operator Spherical Flat Notes
$near Y Y Returns documents in order of nearest to furthest from the point specified using the $geometry parameter. You can also supply two additional parameters, $minDistance and $maxDistance, in order to limit the number of documents returned. You can use either a 2D or a 2Dsphere index.
$nearSphere Y N Operates exactly like $near, but uses a 2Dsphere index and only follows the spherical model.
$geoWithin Y Y Accepts a $geometry argument with type and coordinates keys. The type can be either Polygon or MultiPolygon.
$geoIntersects Y N This operator accepts the same arguments and keys as $geoWithin...